I am not exactly surprised that JSWolf (who is highly critical of Amazon and religiously believes all Kindle owners should switch to Kobos and possibly set fire to their Kindle on the way out) is advocating to leave older Kindle owners out in the cold.
Because as he said, it is their fault if they are stupid enough to use a device that isn't cutting-edge.
Not sure why you agree pdurrant.
All I can say is, @Hitch works in the biz.
And she still goes to efforts to make sure there are decent MOBI fallbacks.
Probably because her livelihood depends on creating working products, and she can't afford to be lazy on top of dismissive of whole swaths of her clients' customer base.
Apparently it is worth it for her.
Diap -- return policies don't save you from one-star reviews...
Now, if all you are doing is making books as a hobby, perhaps to upload to the Patricia Clark Memorial Library, then by all means, don't do any more work than is useful for you personally.